""" 
CSDN : heart_6662
PYTHON amateur   
"""
def move(n, a, b, c):
    if n == 1:
        print(a, '-->', c)
    else:
        move(n-1,a,c,b)   # 将前n-1的盘子从x移动到y上
        print(a, '-->', c)
        move(n-1,b,a,c)

n = int(input('请输入n'))
move(n,'A','B','C')
